I know there is a formula to determine screen size vs seating distance.

So, Is there any rule or rule of thumb of how high to place a large screen HDTV on the opposite wall for viewing without breaking your neck?

It seems silly to ask but there are rules for setting up you speakers for you system. So it stands to reason that there must be someone that could let me know about this too.

Thanks in advance.

JBK

The center of the screen should be at eye level, if you have to look up to see the screen it's too high.
The only place a TV should be mounted higher is in a bedroom where you are laying down in bed to watch it.